Class QueryCompetitions needs settings class.
Update method for future extension
Make sure date are in Mysq format
Wrong session used.
Build sitemap for competition entries and winners
Move actions and filters for WordPress SEO by Yoast.

Place all actions and filter for the plguin WordPress SEO by Yoast into a separate method.
Improve the pages Entries and Winners.
Fix mysql query problem
Update meta descriptions
Small bug, date has to be empty